Dead pw 50 and sad boy.

Bike was running but would quit every once in awhile and then we reved it up and quit like it ran out of gas. took tank off and cleaned took carb off and cleaned.have fuel and spark but wont fire.could it be reed valves?how do you check without tearing them out? has compression

Many things could cause the problem. Let me see if I can help out.
You have spark, but is it enough spark? A weak battery can rob power from the coil so only a weak spark is present. Get a new stock NGK spark plug to eliminate the possibility of a problem plug.

It is good that you cleaned the carb because that would be my second target. Reset the air and idle screws. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean or replace the air filter and be sure the bolts are tight on the carb manifold. INSTALL AN IN-LINE FUEL FILTER. Let the float bowl fill then start the engine. Set the idle speed with the idle screw.Remove the cylinder head. run the piston down to the bottom of the cylinder. look inside the cylinder. On th carb side (intake) you will see an intake port > a large hole that lets gas into the cylinder. Now look at the exhaust port. It is possible the exhaust port is pretty plugged up with carbon. The intake and exhaust ports should be approximately the same size. Are they? If not then remove the muffler and take a screw driver and plastic hammer and knock the carbon into the cylinder, thus enlarging the exhaust port to its' proper size and allowing the exhaust gases to escape. Vacuum the carbon out of the cylinder. De-carbon the piston top and the cylinder head.Get back to me and tell me what you find. If more is needed we will go further.

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There is no need to run anything other than regular gas in the bike, the extra octane only makes the VMax engines run hotter. I would start by adding about a half a can of Sea Foam to about a half tank of gas. Run it at idle until the new mixture is in the carbs 7 or 8 minutes ought to do it. Leave the bike sit overnight, then top off the gas tank and take the bike for a hard ride, ride it like you stole it, this should clear your problem. CV carbs also need to be synced once in awhile and should have been done if you rejetted.

sticky float needle- run some seafoam through a tank of gas- also check for vacuum leaks as the petcock on bikes with a petcock are usually vacuum operated off engine vacuum.. if disconnected or leaky- that will starve the engine once the fuel in the float bowl is used up.

If you have compression then the first thing you check is for spark. If you have spark then you move on to the fuel system. You will have to pull off hoses at a couple of points to see if gas is at the carb and further along. If it is the carb then a simple carb kit will work.

This engine is electronically controlled so the first thing that must be done here is to have the systems control computer tested for fault codes and then do the proper diagnostics based on those codes.

If the bike sat for quite a while, and you didn't drain the tank and carbs, your gas probably gummed up the carbs, jets, needles, etc. If you had them cleaned... this wouldn't be the problem although it could still be a fuel problem. Have you checked the fuel filter? I have found that using a gas stabilizer when the bike is not in use, keeps this from happening.

Before I ever take my bike into the shop, after winter sitting, I always run a mixture of Sea Foam (get it at Wal-Mart) with a full tank of gas for the 1st run of the season. This will take care of most fuel issues.

sounds like a fuel supply problem it probably has some build up in the fuel system from sitting so much, if it has a screen in the bottom of the tank it could be clogged with sediment from the fuel sitting. or in the filter if it has one could be clogged with old gas or dirt particles. Clean the tank if needed, unhook fuel line at engine and make sure there is flow from the tank. I sometimes blow air through the line back up to the tank to back wash any problems.